Britney Spears with sister Jamie Lynn
"She never had to work for anything. Everything was always given to her!!!! If you were me, you might understand asking for 13 years for remixes to go into a small venue show and on tours!!!
"13 years later they assign me as the MOTHER OF ALL… heart of gold… Britney sitting there seeing a 15 minute performance of everything I have ever wanted… But see, I always was the bigger person.
"They all got to DO IT and PLAY ME and I always sat there and took it. But see, now it's a joke… the last thing I would ever do is ask for what was just given to her !!! So yes, they did ruin my dreams."
She confessed that when she asked her sister why she did what she did, she told her "Well, it wasn't my idea".
Britney then went on to wish her sister well with her book before she once again hit out at those who never gave back "what I want".
"…My family ruined my dreams 100 billion percent," she continued. "And try to make me look like the crazy one while I have a 104 degree fever, not being able to move in my bed!!!
"My family loves to pull me down and hurt me always so I am disgusted with them!!!"
Britney Spears hit out at her sister Jamie Lynn in a Twitter rant
Despite her temperature, Britney insists she won't ask to see a doctor and said: "I mean would you if you were me???? JUST SAYING!!!!"
And she admits the lesson she has taken away from the debacle is "don't trust people or anyone".
She concluded: "Make your cats and dogs your family and take care of your own damn self !!!!," before saying she was also taking a break from Instagram.
Shortly after, she joked she "survived" her temperature after fiancé Sam Asghari got her some medicine.